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Title: gh-123471: Make concurrent iteration over itertools.pairwise thread-safe by eendebakpt · Pull Request #144489 · python/cpython · GitHub

Open Graph Title: gh-123471: Make concurrent iteration over itertools.pairwise thread-safe by eendebakpt · Pull Request #144489 · python/cpython

X Title: gh-123471: Make concurrent iteration over itertools.pairwise thread-safe by eendebakpt · Pull Request #144489 · python/cpython

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Open Graph Description: We use a critical section similar to the approach in #132814. The ideas from an earlier PR #125417 are too complex (or not sufficient for thread-safety). We also avoid an incref/decref pair. Iss...

X Description: We use a critical section similar to the approach in #132814. The ideas from an earlier PR #125417 are too complex (or not sufficient for thread-safety). We also avoid an incref/decref pair. Iss...

Opengraph URL: https://github.com/python/cpython/pull/144489

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gh-123471: Make concurrent iteration over itertools.pairwise thread-safehttps://github.com/python/cpython/pull/144489#top
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Feb 4, 2026https://github.com/python/cpython/pull/144489#issue-3898448169
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#132814https://github.com/python/cpython/pull/132814
#125417https://github.com/python/cpython/pull/125417
Make concurrent iteration over pairwise, combinations, permutations, cwr, product, etc. from itertools safe under free-threading #123471https://github.com/python/cpython/issues/123471
Please reload this pagehttps://github.com/python/cpython/pull/144489
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February 4, 2026 21:43https://github.com/python/cpython/pull/144489#commits-pushed-8810175
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add test for pairwisehttps://github.com/python/cpython/pull/144489/commits/88101755c042ca323177f4d91130e7fb02bc9218
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Make itertools.pairwise safe in the FT buildhttps://github.com/python/cpython/pull/144489/commits/11e727dd28aa9f27b6d9e0888152aef3052c41f4
11e727dhttps://github.com/python/cpython/pull/144489/commits/11e727dd28aa9f27b6d9e0888152aef3052c41f4
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add comment for incref rationalehttps://github.com/python/cpython/pull/144489/commits/a91f13ceab22568bdead16c9f4188e6e4302d4cc
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add comment for incref rationalehttps://github.com/python/cpython/pull/144489/commits/931b2f9f17ddee4c944fa840e6291289798a26ef
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February 4, 2026 21:15https://github.com/python/cpython/pull/144489#event-22540631102
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Feb 4, 2026 https://github.com/python/cpython/pull/144489#ref-issue-2494501268
Make concurrent iteration over pairwise, combinations, permutations, cwr, product, etc. from itertools safe under free-threading #123471 https://github.com/python/cpython/issues/123471
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Feb 4, 2026 https://github.com/python/cpython/pull/144489#ref-pullrequest-2584279867
Draft: gh-123471: Make concurrent iteration over itertools.pairwise safe under free-threading #125417 https://github.com/python/cpython/pull/125417
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February 4, 2026 21:17https://github.com/python/cpython/pull/144489#commits-pushed-a030f5a
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Merge branch 'pairwise_ft_v3' of github.com:eendebakpt/cpython into p…https://github.com/python/cpython/pull/144489/commits/9c87957d8fdeb952d270e97cfbb94aabe268555d
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Feb 5, 2026https://github.com/python/cpython/pull/144489#issuecomment-3850820822
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Merge remote-tracking branch 'origin/main' into pairwise_ft_v3https://github.com/python/cpython/pull/144489/commits/78eabbc87d0d4a0941df143cbb9a1f3c24bc43ef
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May 8, 2026 https://github.com/python/cpython/pull/144489#ref-issue-4406369825
Single-threaded re-entrancy via a recursive generator causes an access violation (segfault) in pairwise_next #149557 https://github.com/python/cpython/issues/149557
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